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SubjectRe: [PATCH] kobj_uevent: Ignore if some listeners cannot handle message
On 08/22/2011 09:49 PM, Eric W. Biederman wrote:
> Milan Broz <mbroz@redhat.com> writes:
>
>> kobject_uevent() uses a multicast socket and should ignore
>> if one of listeners cannot handle messages or nobody is
>> listening at all.
>>
>> Easily reproducible when a process in system is cloned
>> with CLONE_NEWNET flag.
>>
>> (See also
>> http://article.gmane.org/gmane.linux.kernel.device-mapper.dm-crypt/5256)
>
> I am fine with the patch below.
>
> However if you are fine with the patch below let's just remove the
> return code from code from kobject_uevent_env. We are now explicitly
> ignoring all of the possible return codes from
> netlink_broadcast_filtered.

Until someone adds a new errno there, I think ESRCH appeared there
the same way:-)

I think the code is better readable now. Whatever, I do not care,
patch is intended to be minimalistic (perhaps for stable series as well now).

Thanks,
Milan

>
> Ignoring all of the return codes from netlink_broadcast_filtered ignores
> all of the expected errors from kobject_uevent_env, short of programmer
> error.
>
> So why have an error code on kobject_uevent_env?
>
>> Signed-off-by: Milan Broz <mbroz@redhat.com>
>> ---
>> lib/kobject_uevent.c | 2 +-
>> 1 files changed, 1 insertions(+), 1 deletions(-)
>>
>> diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c
>> index 70af0a7..ad72a03 100644
>> --- a/lib/kobject_uevent.c
>> +++ b/lib/kobject_uevent.c
>> @@ -282,7 +282,7 @@ int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
>> kobj_bcast_filter,
>> kobj);
>> /* ENOBUFS should be handled in userspace */
>> - if (retval == -ENOBUFS)
>> + if (retval == -ENOBUFS || retval == -ESRCH)
>> retval = 0;
>> } else
>> retval = -ENOMEM;


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